Find the sum of series 3+5+7+9+.............50 terms

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asked Oct 1, 2022 138k views

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Find the sum of series 3+5+7+9+.............50 terms

Mathematics
high-school

Omri Shneor asked

by Omri Shneor

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1 Answer

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Answer: 2600

Explanation:

$u_1=3\\u_2=5=3+2=3+2*(2-1)\\u_3=7=5+2=3+2*2=3+2*(3-1)\\u_4=9=3+2*3=3+2*(4-1)\\...\\u_n=3+2*(n-1)\\\\u_(50)=3+2*49=101\\\\\displaystyle \sum_(i=1)^(50)(3+2*i)=(3+101)/(2) *50=2600\\$

Lmlmlm answered Oct 5, 2022

by Lmlmlm

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